Ion beam driven electrostatic shocks

Details Ion beam driven electrostatic shocks Ion beam driven electrostatic shocks

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9314688p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Dec. 1, 1988, p. 14688-14698. Research supported by CNET.

Computer Science

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Collisionless Plasmas, Electrostatic Waves, Ion Beams, Ionospheric Propagation, Shock Waves, Artificial Clouds, Ion Acoustic Waves, Oxygen Spectra, Xenon

Scientific paper

Electrostatic shock waves were detected during the injection of an artificial xenon ion beam into collisionless ionospheric plasma as part of an experiment flown on a sounding rocket on March 19, 1979. The properties of the plasma/ion beam interaction were recorded as a function of the separation distance to the ion source. The shock structure is described and the Mach number is determined to be 1.09. It is suggested that the shock is weak and turbulent as a result of ion acoustic turbulence in the shock region. This turbulence is probably driven by an ion-ion instability excited by reflected background ions. It is shown that about 50 pct of the background ion population may be reflected from the shock potential. These reflected ions may be responsible for the excitation of the observed lower hybrid and ion cyclotron harmonic waves in front of the leading edge of the beam.

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